Measuring instrument.



2.11. TUCKER.. l MEASURING INSTRUMENT.

APPLIOATION FILED MAY 12, 1909.

953,933. Patented Apr .5,191o.

WITNEEEEE.

MK; @Mw

ihn/ENTER.

ATTDRNEY.

"FFME,

ZECHARIAH R. TUCKER, OF PROVIDENCE, RHODE ISLAND.

MEASURING INSTRUMENT.

To @ZZ whom it may concern:

Be it known that I, ZECHARIAH B. TUCKER, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements in MeasuringInstruments, of which the following is a specification.

My invention relates to micrometric measuring instruments adapted foruse as heigh or depth gages, and calipers, and is designed to provide aninstrument which shall have a measuring capacity in excess of thegraduated area of the structure, and which will enable the operator toemploy any desired measuring unit, and to attain this end in a compactlyarranged structure.

The invention consists in producing the results above specifiedsubstantially as hereinafter claimed.

In the accompanying drawings which form a part. of this specification,Figure 1, is a side elevation of a pair of micrometer calipers embodyingmy invention, Fig. 2, a similar elevation of the same partially incentral longitudinal section, Figs. 3 and 1, rear and front endelevations respectively of the same, and Fig. 5 a section on line 5-5 ofFig. 2.

In the views similar characters of reference indicate like partsthroughout.

1n the preferred construction 1 represents a bar of cylindrical or othercross section, to one end of which is fixed by a pin 2 or otherwise ajaw 3 which jaw if preferred may be removably connected with the bar. Inthe aresent instance the jaw has an end bearing face 41.

Loose upon the bar 1 is a barrel 5 with an exterior micrometric scale 6and whose inner end forms the base of an integral jaw 7 having an endbearing face 8. In a threaded opening 9 in the barrel is a set screw 10whose pointed end 11 registers in a groove 12, extending longitudinallyof the bar 1. The interior of the barrel 5 is bored out a major portionof its length to form an internal abutment 14 at its inner end and anannular space around the bar 1. The interior of the outer end of thebarrel 5 is provided with threads 16 engaging the threads 17 of a hollowmicrometer screw 18 carrying the usual measuring thimble 19 with itsscale 20. Obviously if desired the usual micrometer nut may beintroduced between the barrel 5 and the screw 18.

Specification of Letters Patent.

Application iled May 12, 1969.

Patented Apr. 5, 1910.

serial No. 495,462.

Slidably mounted upon the bar 1 in contact with the hollow interior faceof the screw 18 is a sliding member which in this instance consists of asleeve or bushing 21 provided upon the exterior of its inner end with anannular projection or collar 22 and having an opening 23 to receive ascrew 24C whose point 25 loosely ,extends into the groove 12 to preventthe sleeve 21 from rotary movement. it will be understood that a splineor other well known element may be usedfor this purpose. sleeve hasexterior threads 26 and is longitudinally split as at 27, to formintegral clamping fingers or segments 28, engaged by a clamping nut 29whose threads 30 engage threads 26. Then the nut 29 is tightened itholds the sleeve 21 fast to bar 1, and when loosened, releases the bar1.

.The parts 5, 7, 18, and 19 which comprise an ordinary micrometer framemay be modified in any usual convenient manner. For the screw 10 whichclamps this frame to the bar and holds the latter against rotation anyother convenient clamping means may be substituted.

The operation of my device isas follows. The thimble 19 is turned untilits dial 2O reaches upon the scale 6 the graduation indicative of thespace or measurement which it is understood shall constitute the unit ofmeasurement to be employed in each particular instance. The screw 10 andnut 29 being loosened, the frame andsleeve 21 are moved to the left orinwardly until the bearing faces t and 8 contact with each other, theshouldered end of sleeve 21 contacting with the abutment let. The screw10 is now tightened, and the sleeve 21 is outwardly moved until itsshoulder 22 abuts against the end of screw 18, whereupon the nut 29 istightened. Then the screw 10 is loosened and the frame is movedoutwardly until its abutment 14; rests against the end of sleeve 21,whereupon the screw is again tightened. The space between the bearingfaces 4: and 8 will now be equal to the unit of measurement indicatedupon the barrel 5. The measurements may be indefinitely increased by thedescribed alternating outward movement of the frame and sleeve 21.Fractional measurements may be obtained by employing the dial 20 andscale 6 in the manner usual in micrometer calipers.

By removing the jaw 3 it is obvious that my device may be convenientlyused as a The outer end of the,

depth gage. Then used as a height gage the shape of jaiv 3 is preferablychanged somewhat to form a more stable base.

Wlhat I Claim is,`

l. ln a measuring instrument, the eombination with the frame, of a`threadless measuring bar within the frame and arranged to slidelongitudinally thereof, and a sliding member Within the frame mountedfor longitudinal movement upon the bar.

2. In a measuring instrument, the combination with the frame, of a nonrotary measuring bar within the frame and arranged to slidelongitudinally thereof, a sliding member Within the frame mounted forlongitudinal movement upon the bar, and means adjustably Clamping theslidingmember.

8. In a measuring' instrument, the combination ivith the frame, of ameasuring bar slidably mounted in the frame, a sleeve slidably mountedupon the bar and in slidable Contact with the interior of the frame, andmeans upon the sleeve Within the barrel for limiting the movement of thesleeve.

et. In a measuring instrument, the Combination With the frame, of ameasuring bar slidably mounted in the frame, a slidable sleeve upon theiar intermediate the frame and bar, and elaiuping means upon the sleeve.

5. n a measuring instrument, the Combination With a frame, of ameasuring' bar slidably mounted in the frame, a sleeve slidably mountedWithin the frame and upon the bar, and means upon the sleeve forlimiting the movement of the sleeve upon the bar.

6. in a measuring instrument, the eombination with a frame, of ameasuring' bar Within the frame and arranged to slide longitudinallythereof, a sleeve slidably mount` l I i i ed on the bar within the frameand provided at one end With an annular shoulder m the path of theframe.y and clamping means upon the other end of the sleeve.

T. n a measuring instrument, the combination With the frame, of ameasuring bar slidably Vmounted in the frame, a sliding member upon thebar, and means upon the sliding member for Clamping the bar to thesliding member.

S. ln a measuring instrument, the combination With a frame, of ameasuring bar within the frame and arranged to slide longitudinallythereof, a sleeve slidably mounted on the bar within the frame andprovided `With a shoulder in the path of the frame` and provided ivithspring' fingers. and a Clamping nulL upon the fingers.

9. In a measuring instrument, the Combination ivith a frame, of ameasuring bar slidablv mounted in the frame and provided with alongitudinal groove, a jaw upon thi` bar, a slidahle member upon thebar, means for clamping the sliding member' to the bar, a sereiv in theframe entering the slot in the har, and a sereiv in the slidingl memberregistering in said groove.

l0. ln a measuring instrument, the eombination `with a frame, of ameasuring' bar slidably mounted in the frame, a jaiv upon the bar, asleeve slidably mounted upon the bar, means upon the sleeve aud engagingthe bar to prevent rotary movement of the sleeve, and means upon theframe for preventing rotary movement of the bar.

ln testimony whereof l have atiixed my signature in presence of twoWitnesses.

ZECHi-/XRTAH R. TUCKER Vilitnesses LEONARD lV. HoirroN, M. HIGGINS.

